Coil bending machine for projection lamp filaments



1954 A. GREINER ETAL COIL BENDING MACHINE FOR PROJECTION LAMP FILAMENTSFiled May 29, 1952 4 Sheets-Sheet l Nov. 2, 1954 A. GREINER ETAL2,693,204

con. BENDING MACHINE FOR- PROJEICTION L'AMP FILAMENTS Filed May 29, 19524 Sheets-Sheet 5 i i v lo s"? *3? I i J 1% 1: H 1 I i I INVENTORS Nov.2, 1954 A. GREINER ETAL 2,693,204

COIL BENDING MACHINE FOR PROJECTION LAMP FILAMENTS Filed May 29, 1952 4Sheets-Sheet 4 rgx.

160 g ;BY 9 v ATTORNEY switch which supplies'iesistive a United t e Patifl *com-rrsnmemcm romRomcnoN LAMP 'FIIjAlVIENTS *A'rno cre irrv'in tbn,mir Otto- R9 'Wollentin, -East KeaiiSburg, N. -J.-, assignors "to"Westinghouse Electric Go'rporhti0n, East" Pittsburgh, 'Pa.,"'acorporation of -"Peiinsylv'ania Applicatiom-May 29; 1-952,Srial N 0.290,776

Thisinve'ntidn relates to" a"coil'bending machine and, moreparticularly, to one for bending coils for projection lamp filaments. q

A conventional filament for' an incandescent electric lamp; suchasaFproje'ction lamp," is formed froma con- -tinuous' coihinto abi-planel *section -filarne'ntary deavi'rig 'the first and 'last "sections formounting legs,

remaining four 'sectibnsfasinner' or center'sections.

The purpose-of-this'inventionisto pr'ovlde a col'bendingmachine*fori'produeing a be'ndin a continuouslywoundcoilio'r'med-of one'turrf'ofthe coil at apredetermine'd distance ornumber of turns from" a desired point on the coil. Thebendi'ngoperationfln'the example cited,

is perfor-m'ed nine times at'desiredpredetermined intervals *Aillftensectionsjof thefab oye meritionedlamp filamentare-alternately staggeredandshow a series of'five 193m (in one side and-a seriesof four loops onthe other s1 e.

"he bending machine"'of'buifiiriventionisf'provided with iven by-afractional horse power electric;- 'rnotor, halid l'eyer is' nioveddownwardly to advar'icea" coil bending bladen'owarwa continuous coil(positioned against a coilst6p "andjloca'tor' on a bending head), "justniaking coiitact therewith. In the course of its waver-the hand levercurse Fcioil- Preheat micro switch "circiiit'for'preheating-the;coil.At'theend 'of-itsniotion,' "'the hand lever trips 3 01111611releasel'ever, thereby 'rele'asiiig' a' one revelation-"clutch Whichthenmoves the earn-shaft through one cyclebf the operation. coil heatingswiteneonrrm (or Nof l) cam-activates a second micro h't-ftd-thecont'inuous coil ding f r-Fa; pe (ad of time-whichiscona'r'ied b'y the a justiible characteristics of the lbcat'or'" (ofNo; z'rc m'mov'es the coil "ts dif ipositibn. 'Sirnlultaneously 'abendiiig blade '(br-'No.'-3) earn moyes-'the"coil be'ridirig blad'fdrward ihtdtheoilarid securing one turn of the coil between the bladeand apair of bending chisels, thereby establishing an electric heatcircuit through the coil. The-"chiSeIsF' 'tre lbcatdresp'e'citivelyon apair of '"l h are moved in aci'rcular motion e pbst b'y a pair of links;commonly de,'fwhi c h""in; 'turn 'is actichisehop ting "No; 4) 'cam.

bpe'ratiom 'tlie co1l bend'in'giblade is ing machine.

tion and the bending chisels are returned to their starting positionbytheNos lcam Simultaneously the No. 2 cam returns the coil stop andlocator mechanism to its infi'position. Meanwhile th'e'=clutch' hasarrived at its -star ting position and is 'stopp'ed' there' byengagement with the:clutch releas'e lever,=thereby completing the cycle-for forming -=o"ne"bendor *l'oo'p "in the continuous coil. NineSuchc'ycIes ai'e required-in theexample cited above, to completetliebending' an'dfor ming of the ten sections of thexprojec'tion' larnpfilament. t p p In'its" general aspects; 'an-object' of the'presentinvention is to produce a-'coil bendingi'inachine for forming a bend orloop* in a ctintinuouscoiL from one"predetermined turn thereon. i 7

Another object is to produce a coil bending machine for forming a series6f loops br bends in a continuous coil -apredetermined desired distanceapart, to thereby shape a bi-plane multi section"filament" for alprojection 2,693,264 n i eat d- Net-%1195 :1

igure; 3 -1s' a fragm'eirtary elevationaliviewof a: iconice A ventionalprojection lamp having-a bi=planemulti-s'ection filament which may beformed by 4he-machine-of our nv nti i, t it H E- igure 4 is-a -p'lanview of' such ai projection lamp l me n, o v. A Figure 5 is agplan' viewof a" coil bending head-showin a coil bending blade' and'a;pair'of-hinged bending ehisels at the startofa loop;forrningacycle. r rH Eigureb isga yertiealsection' l view; ofithe coil bending head on; theline VI- -VI ofFigure 5in the-direction-of e-at Qw -t U.

Figure 7 isa horizontal sectional view of the coil bending-head on; the;line V II- V-II o f F igure;d showing thecoil bending bladejustrnak-ingcontact with a continuously 'w uqd coilwhich is to be-ben t,A h A I F u 8- "li u/si a t i e 7 's ow ng' h e d- "ingjblade' in itsfinal position"; and one turn ofthecoil secii'redbetween ebendirig-chisels. H 1 g Figure 9'=i s a w 's'imilart to Eigure;-8showing;the formation ofa be in the coil bycircular motion of the il d'ingl hi$ Sl W IdrthQ1wil 'be d ngi l de A F e 0. Hi sim a to F urho'wifiga reftration' 2 ".i eflse zb'qndinaib d .WiIh1't ?b 2 Q 1thereon and a return of the bending chisels to *the neutraI or startingposition. V

Figure 1 1=-.-is* a view 'sirnilar= to' Fi'gure lO shdWing a furtherretraction of the coil bending blade a gd a return Figure- 1-7 -is agramof operations'ofthecdilberid- Referring to the drawing s andinparticular to Figures 1 and 2, a"coil'behding machirie for projectionlamp filaments is designated byxstl'ie referenee'=iiumeral'-'10. Thismach'inehas 'anfr'am'e ll' comprisiiig a platform 1'2f' 'and base 13integrated shy suitable sidel plates and o'rner supports. A hand lever14- is-' mounte'd on* an'burer or hand lever shaf t '=16,which.'is*rotatable'iniai pair "of "hand lever mounting brackets 17 and18 de 'i'ei'idir'ig from -':t'li'e bottom surface-of the topTllOlliltll'lg plate ofthe frame 'll.

of the bending chisels as hereinafter described. One end of a lever 36mounted in a suitable bracket 38 (upstanding from the base 13) carries apin which slides in the slot 30. The opposite end of the lever 36carries a pin which is similarly engaged in a U-shaped slot in the upperend of a clutch release lever 40.

The other end of the clutch release lever 40 is secured to one end of aclutch release shaft 42 which rotates in a suitable bushing in thebracket 38 and another bushing in a similar bracket 44 (Fig. 2). On theother end of the shaft 42, adjacent bracket 44, is a clutch releaselever 46 for releasing a one revolution clutch 47 on a main cam shaft48. An arm 49, having a spring between its left hand end (when viewed inFig. l) and the base 13 of the frame 11, provides suitable return meansfor the clutch release shaft 42.

Adjacent the arm 22 on the hand lever shaft 16 is a bending blade triparm 50, shown in Figure 1. The outer end of the arm 50 is engageablewith a lower pin 51 extending from a bending blade arm 52 secured at itsupper end to a gear segment shaft 54 which is rotatable thereby insuitable bearings on a coil bending head bracket 56. A bending bladegear segment 58, secured to the outer end of the shaft 54, engages arack 59 which is slidable in a trough 60 formed in the upper surface ofthe coil bending head bracket 56.

It will be understood that downward movement of the hand lever 14(Fig. 1) causes forward movement of the rack 59 by means of theconnecting linkage just described. Secured on the slide rack 59 bysuitable means, such as screws, is a pair of bending blade mountingplates or blocks 62 and 64, connected by a right and left handadjustment screw 66. Adjustably mounted in a lateral slot in the forwardend of the mounting block 64 is a bending blade holder 68 which carriesthereon a bending blade 70 for movement against and then insertion intoa space between two predetermined turns of a continuous coil 71.

Bending blade final positioning cam mechanism Adjacent the bending bladetrip arm 50, an adjustable bending blade connecting rod 72 (Fig. 1) issecured to the pin 51 carried on the lower arm of the bending blade arm52, as shown in Figure 2. The other end of the connecting rod 72 ispivoted to the upper end of a bending blade cam arm 74, shown mostclearly in Figure 1, which has its lower extremity pivoted in a suitablebearing on a bracket 76 mounted on the base 13 of the frame 11. The camarm 74 carries a cam roller 78, a suitable distance between the bracket76 and the connecting rod 72, for engagement with a bending blade finalpositioning cam 121, as hereinafter explained. Suitable return means forthe connecting rod 72 is provided by a spring 80, shown in Figure 1,extending from the left end portion of-the rod 72 to a mounting pin 81depending from the platform 12 of the frame 11.

The main cam shaft 48 is mounted on three brackets 84,85 and 86, shownin Figure 2, on the base 13 of the frame 11 and driven through gears ina gear box 88 by suitable means such as a H. P. motor (not shown).

Coil stop and locator cam mechanism As shown particularly in Figure 2, acoil stop and locator cam 90 is aflixed to the shaft48 adjacent thebracket 86, for moving a coil stop and locator 92, as hereinafterexplained. A locator cam arm 94, shown in Figure 1 adjacent the cam 90,having its lower end rotatably pivoted to a suitable bracket 96upstanding from the base 13 of the frame 11, carries a cam roller 98 andhas its upper end connected to an adjustable locator connecting rod 100.The other end of the rod 188 is pivoted to a lower horizontal locatorarm 102 (Fig. 2) having its other end fixed on a vertical locator shaft104, which rotates in a bearing bracket 106 mounted on the platform 12.The upper end of the shaft 104 is connected by means of a horizontalupper locator arm 187, fixed thereon as shown in Fig. 2, to the coilstop and locator 92 by a vertical pin 93 on the end of arm 107, securedin an annular groove 108 in the end of the locator 92.

The coil stop and locator 92 is slidable (in a direction transverse tothe bending blade 70) in a suitable bearing mounted in a coil stop andlocator bracket 110. A U-shaped horizontal bracket 112, shown in Figure2, is provided on the bracket 110 under the locator 92. Bracket 112 hasa pair of adjustment screws 113 and 114 extending toward one anotherfrom its arm for engagement with a lug depending from a guide 115carried on the locator 92 adjacent the groove 108 therein. An adjustablestop 116 is provided in the upper portion of the guide 115 for limitingforward motion of the locator 92 by engaging the outer surface of thebracket 118. The end of the locator 92 adjacent the blade 78 is providedwith a coil positioning slot 118 (Fig. 5). A return spring 119 (Fig. 1)extends from a pin on the connecting rod 100, near its connection withthe arm 94, to pin 120 depending from the platform 12.

Coil stop and locator cam Adjacent the coil stop and locator cam 90 onthe cam shaft 48, is the bending blade final positioning cam 121 whichengages the roller 78 on the cam arm 74, as shown in Figure l.

7 Bending chisel operating cam mechanism Adjacent the cam shaft bracket85 is the bending chisel operating cam 122 (Fig. 2). A bending chiselbell crank lever 124, shown in Figure 1, is pivoted on a bracket 126depending from the platform 12 and has a cam roller 128 on one arm inengagement with the cam 122. The other arm of the lever 124 isbifurcated to leave a slot 130 in its upper end. A drive block 132slides in the slot 130 and its movement is limited by adjustment screw133 carried by a plate 134 bridging the slot 130. The block 132 isconnected by a air of links 136 to a driven block 138, depending rrom abending chisel slide block 140. A center clearance hole or slot 139shown in Figure 2, is provided in the slide block 140, through which theupper arm of the bell crank lever 124 moves. A slide block return spring142 has one end connected to the slide block 148 above the driven block138 and its other end connected to a suitable pin projecting from theplatform 12. This block is slidably carried by a mounting bracket 144upstanding from the platform 12.

A pair of bending chisel links 146 and 148, shown in Figures 5 and 6,are connected by means of a common pivot pin 149 (Figs. 1 and 2) to theforward portion of the bending chisel slide block 140. The forwardportions of the links are respectively connected to a pair of hingedelements 150 and 152 (Fig. 6) which swing about a center hinge post 154.This post 154 in turn is mounted on a suitable bracket 156 (Fig. 1)upstanding from the platform 12. The hinged elements 150 and 152 carrybending chisel mounting plates 158 and 160, respectively, on which aremounted bending chisels 162 and 164, respectively, in normally parallelspaced relation to each other, for insertion from the opposite directioninto the adjacent spaces in the two preselected turns which bound theblade receiving space.

Coil heating switch control cam mechanism On the end of the main camshaft 48 adjacent the cam shaft bracket 84 is a coil heating switchcontrol cam 166 (Figure 2) which engages a roller 168 on the end of acoil heating switch arm 170, pivoted on a bracket 172. This bracket 172also supports a normally open heating control micro switch 174 which issuitably connected in series with a variable resistor 175, as shown inFigure 16.

Preheating circuit for turns The coil preheating circuit (Fig. 16) hasone side of the voltage supply L1 connected to the bending blade 70. Theother side of the supply L2 is connected thru the normally openmicroswitch 34 and the variable resistor 35 to the bending chisel 164.The other bending chisel 162 is tied electrically to the chisel 164 by asuitable line. It will be understood that the downward motion of thehand lever 14 pushes bending blade 74} into contact with the continuouscoil 71, and the coil in turn against the bending chisels 162 and 164,and closes switch 34, thereby completing the circuit.

Heating circuit for turns In the main .coilheating circuit, as shown inFigure 16, normally open microswitch 174 and variable resistor 175 inelectrical series with each other, are in electrical parallel with theswitch 34 and resistor 35. The circuit jcqtnpleted by. the closing .of.switch 174-.upon. operation of the 166.-

Operation According to our invention, the continuous coil 71' is. placed'on the center hinge post 154, as shown in Figure 5, and moved by handaxially toward the locator 92, so that its forward end is suliicientlyclose to the coil-positioning segment shaft 54 and the gear segment 58thereon are.

rotated clockwise by means of the bendingblade arm 52. This clockwisemotion of the segment 58 moves the rack 59 to the right, as viewedinFigures 1 and 2, in trough 60, and hence until the bending blade 70justtouches the coil 71, as shown in Figure 7.

When the bending blade 70" has completed approximately /2 of its travelas shown in Figure 17, the normallyvopfin microswitch 34 in the coilpreheat circuit is closed by the action of the trip arm 32 on thebending blade slide rod 28. The counterclockwise rotation of thehandlever shaft 16 and arm 26 thereon causes the. slide ro d,2 8, and hencethe trip arm 32 thereon, to .move diagonallyupward, as shown in Fig. l,to close the switch 34', also shown in Figure 16, and thereby supplypreheat current to the coil, 71. Thisswitch 34 remains closed until thehand lever 14 is released.

. Slightly before th lever 14 and the bending blade 70 reaches the en'dof their respective travels, the clutch release leyer 46 on the clutchrelease shaft 42 releases the one revolution clutch 47, and the camshaft 48, driven by the motor, with the cams 90, 121, 122 and 1-66thereon, start "their revolution. The clockwise rotation of shaft 16'and the arm 26 thereon, causing the diagonally upward movement of theslide rod 28, also causes the clockwise rotation of the shaft 42-and theclutch release lever 26 thereon, bymeans ofthe connecting. linkageheretofore. described,

As the main cam shaft 48 starts to turn, themicro switch 174' is closedby engagement of a raised portion ofithecoil heating switch control earn166 with the roller 168 on the contact arm 170. As shown in Figure 16,clo'singof the switch 174. supplies heating current through 3; resistcir17,5 and the bending chisels 162 and 164 to Further rotation of the maincam. shaft Y43 and bending,

blade final positioning cam 121 thereon, positions thebending-bladeflt).in its final position, approximately .015 further into. the. spacebetween the two preselected turns; of-the coil, 71, thereby securelyholding one turn of the coil, betweenithe-bending blade 70 andthetwo-bending chisel's 162. and. 164, which are. now insertedv from,the

opposite direction-in the adjacent spaces in. the two preselectedturnswhich bound the blade receiving space.

A;rai'sed.p ortion of. the cam 121' moves the roller 78, and

hence the cam arm.74 and the connecting rod 72, toward theleftend of themachine, when viewed .in. Figure 1. This motion of the rod. 72. movesthe bending blade arm 52'fon the gear segment shaft 54- and hencerotates clockwise the gear segment 58 on theother endof shaft 54, to,cause the additional required motion of the, bending blade 70,asshownin.Figure 8.

Simultaneously, as shown in-Figure' 17,, the coil stop and .-.l'0cator.v cam..90rnoves the coil stop and locator 92 from. its .inposition(Figs. 7 and 12) to its out position. Rotation} of a raised'portionofthe cam 90 against theroller. 98-moves the locator cam arm; 94and the connectingfrod 160 horizontally tothe right, when viewed inFigures. 1 and 2, This motion rotates the lower arm 102' onjthe bottomof the vertical shaft 104, and hencethe shaft104 v (and the upper arm108'on the upper portion ofthe shaft-104 with its pin 93 on'the outerend) clockwisein a horizontal plane. Thispin 93 in the groove 108.on-the.rearward portion of the coil stopand. locator 92, movesithe locator92 away from;the post 154 or to its, out'.- position.

Eunther rotation of. the mam cam 8113111148 causes the bending claisels- 162and p 16.4.- to swing 011., the; hinged:

elements:- 156 and ii 152 respectively 'about the-centerhingepost 154;-as sshowninFigure 9, andv bend the coil '71 about its preselected turninto parallel 1 sections alignedalongthe bending blade; 70.; Thisaction-of the chisels" is accomplished-by operation of the'bendingchiselop eratingcam 122 through-its connecting linkage. A raised portionofthecarn 12 2 moves therol-ler 128 on-the pivotedbell-cranklever:124-Lupward, and hence'the drive blockvl32sintheslot 130' (Fig. 1)'- in-the upper endofthe crank 124 towardsthe centerhinged post-154. This" tion of the swinging of the bendingchisels 162' and-164,

the main heating; switch 174 isopene'dby means ofthe coilihcating'switch control cam 166, F urth'er rotation'of the main cam shaft 4&movesthe-roller-128 on crank 124- off the. raised portion of cam l22 'therebymovingthe slide bloclc 1410 and the bending 'ch-isels16-2 'and'164 connected thereto back to their" starting position, with the aid of thereturn. spring142, as shown in Fig; 10.

Before the bending chisels complete their return to the starting orneutral position, roller 78 -011 the bending; blade earn arm 74runsoft-the raised portion of thebending. blade final=positioning cam-121thus releasing the bending blade 70 and the now bent coil 71 thereon, bymeans of the connecting mechanism explained above and with the help. ofthe return springfii) on the end of rod v72 (Fig.1).

A short time (Fig, 17) after the return of 'thebending chisels 162andl64 -to their-starting position, the roller 98 rolls off the raisedportion of 'the coil stop and locator cam and the coil stopand locator92" is. returnedto-its in?"'position, as shown in Figure 11, by-means-of the connecting mechanism explained above and the return spring11-9 on: theqconnect-ing rod- 108' (Fig. 1).

Just before the end of theon'erevolution of the main cam .shaft'-48,"which require's a .few second's, the

clutch release lever 46 (Figs. 1 and 2)- engages the one-revolutionclutch 47-andstops further rotation of the main camshaft' 48' 'and thecams 99', 121,122 and 166 thereonr v The now' bent coil '71 is removedfrom the bending blade 70 and inserted by hand into the coil stop andlocator slot 118; shown in Figure 12, on the inner end of the coil stopand locator 92';

It will be understood that this slot 118 is positioned .so that" thedistance from the inner face of the slot to the center ofthe hingepost154 ,the-point of contact of the. bending blade 70 with the coil 71, isthe desired distance or the desired number of turns between bends yet tobe formed in the remainder of the coil 71. Considered another way, thisabove mentioned position of theslot 118' in locator 92 determines thelength of theeight remaining inner and outer sections of a tile. ment'181' shown in Figures 3 and 4" to'be formed from thecoil 71. Further thepitch between-sections of the" coil 71- can be controlled andhencea'unifor'm light source canbe obtained, as shown in, Figure 14, byadjustingthe angle which the axis of the slot 118 makes with thehorizontal top'of the post 154.

As the cycle is repeated and successivebends or sections of the filament181 are formed in-the coil 71 by the method described above, the coil 71is positioned in the. slot 118' at the start of each. succeeding cycle,

as shown in Figure; 14, with thealready formed five sections,positioned. away from the swinging-movement of. the bendingchisels.162.and 164.

Thus it willbe seen. from the foregoing description that our: invention.has. provided: a coil-bending machine- 10'. for forming a seriesof loopsor bends ina continu ous. coil 71' apredetermined distance apart toproduce a bi-plane multiesection. filament 181 for a prQ ection lamp.182,..as shown'in Figure 3.

This machine- 10 comprises a main cam shaft 48' having. thereon, a onerevolution clutch" 47, a coil stop and locator cam 90, a bending bladefinal positioning cam 121, a. bending: chisel operating'cam 122,: andacoil heating switch control cam 166 which through the: appropriateconnecting mechanism. described: above, respectively. move'za coil:stop. and locator. 92 from its in? to; its: out. position, finally.position .the bending bladezflfil against; the..coil 71:. and .the.bending-chisels*- 162 and 164, swing the bending chiseis 162 and 164about the center post 154 to form the desired loop in the pre-selectedturn of coil 71 and provide heat to the coil 51 during the bendingoperation. A hand starting lever 14 and its connecting mechanism isprovided for moving the blade 70 into contact with the coil 71, closingthe coil preheat circuit shown in Figure 16 and releasing the onerevolution clutch 47 on the main cam shaft 48, thus starting the onerevolution of the shaft and the above mentioned cams thereon.

Although an embodiment of the invention has been described, it will beunderstood that modifications may be made within the scope of theinvention.

We claim:

1. A machine for bending a continuous coil into a bi-plane multi-sectionprojection lamp filament having a pre-determined desired number of turnsbetween sections comprising a frame, a bending blade on said frame formovement against and then insertion into a space between twopre-selected turns of said coil, a pair of bending chisels on said framein normally parallel spaced relation opposite said bending blade, forinsertion from the opposite direction into the adjacent spaces in thepre-selected turns which bound the blade-receiving space, a coil stopand locator on said frame for determining the pre-selected turns, a coilstop and locator mechanism on said frame for moving said locator intoits in and out positions, a coil preheating circuit for heating saidcoil prior to said bending, a main heating circuit for heating said coilduring bending, a hand lever mechanism on said frame for advancing saidbending blade into contact with said coil, closing said coil preheatingcircuit and tripping a clutch release lever, a bending blade finalpositioning mechanism on said frame for inserting said bending bladeinto the space between said pre-selected turns, a bending chiseloperating mechanism on said frame for pivotably moving said bendingchisels about a common axis away from each other and aligning said bentcoil sections along said bending blade, to bend the pre-selected turn ofsaid coil therearound into a loop, and thereby form the coil into twosections, and an automatic driving and timing mechanism on said framefor said coil stop and locator mechanism, said bending blade finalpositioning mechanism, and said bending chisel operating mechanism.

2. A machine for bending a continuous coil into a biplane multi-sectionprojection lamp filament having a pre-determined desired number of turnsbetween sections comprising a frame, a bending blade on said frame formovement against and then insertion into a space between twopre-selected turns of said coil, a pair of bending chisels on said framein normally parallel spaced relation opposite said bending blade, forinsertion from the opposite direction into the adiacent spaces in thepreselected turns which bound the blade-receiving space, a coil stop andlocator on said frame for determining the pre-selected turns, andautomatic driving and timing mechanism on said frame comprising a maincam shaft mounted on said frame, and a one revolution clutch, a coilstop and locator cam, a bending blade positioning cam, a bending chiseloperating cam, and a main coil heating switch control cam on said maincam shaft, a coil stop and locator mechanism on said frame for movingsaid locator into its in and out positions, a coil preheating circuitfor heating said coil prior to said bending, a main heating circuit forheating said coil during bending, a hand lever mechanism on said framefor advancing said bending blade into contact with said coil, closingsaid coil preheating circuit and tripping said clutch release lever, abending blade final positioning mechanism on said frame for insertingsaid bending blade into the space between said pre-selected turns, and abending chisel operating mechanism on said frame for pivotably movingsaid bending chisels about a common axis away from each other andaligning said bent coil sections along the bending blade, to bend thepreselected turn of said coil therearound into a loop, and thereby formthe coil into two sections.

3. A machine for bending a continuous coil into a biplane multi-sectionprojection lamp filament having a predetermined desired number of turnsbetween sections comprising a frame, a bending blade on said frame formovement against and then insertion into a space between twopre-selected turns of said coil, a pair of bending chisels on said framein normally parallel spaced relation opposite said bending blade, forinsertion from the opposite direction into the adjacent spaces in thepreselected turns which bound the blade-receiving space, a coil stop andlocator on said frame for determining the pro-selected turns, anautomatic driving and timing mechanism on said frame comprising a maincam shaft mounted on said frame, and a one revolution clutch, a coilstop and locator cam, a bending blade positioning cam, a bending chiseloperating cam, and a main coil heating switch control cam on said maincam shaft, a coil stop and locator mechanism on said frame for movingsaid locator into its in and out positions, said coil stop and locatormechanism comprising a locator cam arm adjacent said coil stop andlocator cam carrying a roller for engagement therewith, a locatorconnecting rod on the upper end of said locator cam arm having its otherend secured to a lower horizontal locator arm, said lower horizontallocator arm in turn secured to the lower end of a vertical locatorshaft, an upper locator arm on the upper end of said locator shaftcarrying a vertical pin on its outer end, said coil stop and locatorbeing slidable transverse to said blade and said bending chisels in acoil stop and locator bracket and provided with means for connectionwith said pin on said upper locator arm, a coil preheating circuit forheating said coil prior to said bending, a main heating circuit forheating said coil during bending, a hand lever mechanism on said framefor advancing said bending blade into contact with said coil, closingsaid coil preheating circuit and tripping said clutch release lever, abending blade final positioning mechanism on said frame for insertingsaid bending blade into the space between said pre-selected turns, and abending chisel operating mechanism on said frame for pivotably movingsaid bending chisels about a common axis away from each other andaligning said bent coil sections along the bending blade, to bend thepreselected turn of said coil therearound into a loop, and thereby formthe coil into two sections.

4. A machine for bending a continuous coil into a bi-plane multi-sectionprojection lamp filament having a predetermined desired number of turnsbetween sections comprising a frame, a bending blade on said frame formovement against and then insertion into a space between twoore-selected turns of said coil, a pair of bending chisels on said framein normally parallel spaced relation opposite said bendingblade, forinsertion from the opposite direction into the adjacent spaces in thepreselected turns which bound the blade-receiving space, a coil stop andlocator on said frame for determining the pre-selected turns, anautomatic driving and timing mechanism on said frame comprising a maincam shaft mounted on said frame, and a one revolution clutch, a coilstop and locator cam, a bending blade positioning cam, a bending chiseloperating cam, and a main coil heating switch control cam on said maincam shaft, a coil stop and locator mechanism on said frame for mov ingsaid locator into its in and out positions, a coil preheating circuitfor heating said coil prior to said bending, a main heating circuit forheating said coil during bending, a hand lever mechanism on said framefor advancing said bending blade into contact with said coil, closingsaid coil preheating circuit and tripping said clutch release lever, abending blade final positioning mechanism, on said frame for insertingsaid bending blade into the space between said pre-selected turns, saidbending blade final positioning mechanism comprising a bending blade camarm adjacent said bending blade final positioning cam and provided witha roller for engagement with said bending blade cam, a bending bladeconnecting rod on the upper end of said bending blade cam arm, a bendingblade trip arm secured at one end of said bending blade connecting rod,a hand lever shaft on said frame for carrying the other end of saidbending blade trip arm, a gear segment shaft on said frame, a bendingblade arm on said gear segment shaft in contact with the upper end ofsaid bending blade trip arm and for causing rotary motion of said gearsegment shaft, a gear segment on said gear segment shaft, a rack inengagement with said gear segment and means on said rack for mountingsaid bending blade and a bending chisel operating mechanism on saidframe for pivotably moving said bending chisels about a common axis awayfrom each other and aligning said bent coil sections along the bendingblade, to bend the preseiected turn of said coil therearound into a loopand thereby form the coil into two sections.

5. A machine for bending a continuous coil into a biplane multi-sectionprojection lamp filament having a pre-determined desired number of turnsbetween sections comprising a frame, a bending blade on said frame formovement against and then insertion into a space between twopre-selected turns of said coil, a pair of bending chisels on said framein normally parallel spaced relation opposite said bending blade, forinsertion from the opposite direction into the adjacent spaces in thepreselected turns which bound the bladeqeceiving space, a coil stop andlocator on said frame for determining the pre-selected turns, anautomatic driving and timing mechanism on said frame comprising a maincam shaft mounted on said frame, and a one revolution clutch, a coilstop and locator cam, a bending blade positioning cam, a bending chiseloperating cam, and a main coil heating switch control cam on said maincam shaft, a coil stop and locator mechanism on said frame for movingsaid locator into its in and out positions, a coil preheating circuitfor heating said coil prior to said bending, a main heating circuit forheating said coil during bending, a hand lever mechanism on said framefor ad.- vancing said bending blade into contact with said coil, closingsaid coil preheating circuit and tripping said clutch release lever, abending blade final positioning mechanism on said frame for insertingsaid bending blade into the space between said pre-selected turns, and abending chisel operating mechanism on said frame for pivotably movingsaid bending chisels about a common axis away from each other andaligning said bent coil sections along the bending blade, to bend thepreselected turn of said coil therearound into a loop, and thereby formthe coil into two sections, said bending chisel operating mechanismcomprising a bending chisel bell crank lever provided with a roller forengagement with said bending chisel operating cam and a bifurcated upperend, a bending chisel slide block connected to the bifurcated end ofsaid bell crank lever, a slide block mounting bracket on said frame forslidably supporting said slide block, a pair of bending chisel linkscommonly connected to the forward portion of said slide block, a hingedelement on the forward portion of each bending chisel link for carryingthereon said bending chisels and a center hinge post for carrying saidhinged elements in pivotable movement thereabout.

6. A machine for bending a continuous coil into a biplane multi-sectionprojection lamp filament having a pre-determined desired number of turnsbetween sections comprising a frame, a bending blade on said frame formovement against and then insertion into a space between two re-selectedturns of said coil, a pair of bending chisels on said frame in normallyparallel spaced relation opposite said bending blade, for insertion fromthe opposite direction into the adjacent spaces in the preselected turnswhich bound the blade-receiving space, a coil stop and locator on saidframe for determining the pre-selected turns, an automatic driving andtiming mechanism on said frame comprising a main cam shaft mounted onsaid frame, and a one revolution clutch, a coil stop and locator cam, abending blade positioning earn, a bending chisel operating cam, and amain coil heating switch control cam on said main cam shaft, a coil stopand locator mechanism on said frame for moving said locator into its inand out positions, a coil preheating circuit for heating said coil priorto said bending, a main heating circuit for heating said coil duringbending, a hand lever mechanism on said frame for advancing said bendingblade into contact with said coil, closing said coil preheating circuitand tripping said clutch release lever, a bending blade finalpositioning mechanism on said frame for inserting said bending bladeinto the space between said pro-selected turns, a bending chiseloperating mechanism on said frame for pivotably moving said bendingchisels about a common axis away from each other and aligning said bentcoil sections along the bending blade, to bend the preselected turn ofsaid coil therearound into a loop, and thereby form the coil into twosections, and a coil heating switch mechanism for transmitting motionfrom said coil heating switch control cam for closing a switch'in saidheating circuit, and comprising a heating switch arm carrying a rollerthereon for engagement with said coil heating switch control cam, and aheating control switch in said coil heating circuit mounted on saidframe and operable by said heating switch arm.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,726,480 Fehse Aug. 27, 1929 2,181,288 Washburn Nov. 28, 19392,272,869 Herzog Feb. 10, 1942 2,449,653 Isaac Sept. 21, 1948

